package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderDetailMapper;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.*;
import java.util.stream.Collectors;

/**
 * @author 梦龙
 * @date 2023/12/13 10:46
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * @description:统计指定时间内区间的营业额数据
     * @return: com.sky.vo.TurnoverReportVO
     * @author: 梦龙
     * @time: 2023/12/13 10:45
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        //当天的营业额
        List<Double> turnoverList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        for (LocalDate date : dateList) {
            //查询date日期对应的营业额，营业额是指状态为已完成的订单的金额的总和，时间是当天00:00到23:59
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //查询数据库
            //select sum(amount) from orders where order_time >begin_time and order_time < end_time and status = 5
            Map map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            map.put("status", Orders.COMPLETED);
            Double turnover = orderMapper.getSumByMap(map);

            turnover = turnover == null ? 0.0 : turnover;

            turnoverList.add(turnover);
        }

        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList, ","))
                .build();
    }

    /**
     * @description:统计指定时间区间的用户数据
     * @return: java.lang.Object
     * @author: 梦龙
     * @time: 2023/12/13 14:35
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        //存放每一天的日期
        List<LocalDate> dateList = new LinkedList<>();

        //存放每天新增的用户的数量
        List<Integer> newUserList = new LinkedList<>();

        //存放当天结束前所有用户的数量
        List<Integer> totalUserList = new LinkedList<>();

        //存储从begin 到 end 每天的时间
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("end", endTime);
            Integer totalUser = userMapper.getCountByMap(map);

            map.put("begin", beginTime);
            Integer newUser = userMapper.getCountByMap(map);
            totalUserList.add(totalUser);
            newUserList.add(newUser);
        }

        //封装了结果数据
        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /**
     * @description:统计指定时间内的订单数量统计
     * @return: com.sky.vo.OrderReportVO
     * @author: 梦龙
     * @time: 2023/12/13 15:45
     */
    @Override
    public OrderReportVO getOrdersStatistic(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内每天的日期
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);
        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Integer> orderCountList = new ArrayList<>();
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            Map map = new HashMap<>();
            map.put("begin", beginTime);
            map.put("end", endTime);
            //查询每天的订单总数
            // select count(id) from orders where order_time >? and order_time < ?

            Integer orderCount = orderMapper.getCountByMap(map);

            map.put("status", Orders.COMPLETED);
            //查询每天的有效订单数
            //select count(id) from orders where order_time > ? and order_time < ? and status = 5 5表示已完成
            Integer validOrderCount = orderMapper.getCountByMap(map);
            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        //计算时间区间内的订单数量和有效订单数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }

        return OrderReportVO.builder()
                .orderCompletionRate(orderCompletionRate)
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .dateList(StringUtils.join(dateList, ","))
                .build();
    }

    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);

        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());

        return SalesTop10ReportVO.builder()
                .nameList(StringUtils.join(names, ","))
                .numberList(StringUtils.join(numbers, ","))
                .build();
    }

    /**
     * @description:导出运营数据报表
     * @return: void
     * @author: 梦龙
     * @time: 2023/12/14 11:16
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1. 查询数据库，获取营业数据——查询最近30天的营业数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2. 通过POI将数据写入到Excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");

        try {
            //基于模板文件，创建一个新的Excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);

            //获取表格文件的sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");

            //填充数据--时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + " 至 " + dateEnd);

            //获得第四行
            XSSFRow row = sheet.getRow(3);
            //营业额
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            //订单完成率
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            //新增用户数
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            //获得第五行
            row = sheet.getRow(4);
            //有效订单
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            //平均客单价
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());

            //填充明细数据
            for (int i = 0; i < 30; i++) {
                LocalDate date = dateBegin.plusDays(i);
                //查询某一天的营业数据
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获得某一行上的数据
                row = sheet.getRow(7 + i);
                //日期
                row.getCell(1).setCellValue(date.toString());
                //营业额
                row.getCell(2).setCellValue(businessData.getTurnover());
                //有效订单
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                //订单完成率
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                //平均客单价
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                //新增用户数
                row.getCell(6).setCellValue(businessData.getNewUsers());
            }

            //3. 通过输出流将Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            out.close();
            excel.close();
            in.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }
}
